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#!/usr/bin/env python
"""
client.py
Client for a client/server example
"""
import qpid
import sys
import os
from qpid.util import connect
from qpid.connection import Connection
from qpid.datatypes import Message, RangedSet, uuid4
from qpid.queue import Empty
#----- Functions -------------------------------------------
def dump_queue(queue_name):
print "Messages on queue: " + queue_name
message = 0
while True:
try:
message = queue.get(timeout=10)
content = message.body
session.message_accept(RangedSet(message.id))
print "Response: " + content
except Empty:
print "No more messages!"
break
except:
print "Unexpected exception!"
break
#----- Initialization --------------------------------------
# Set parameters for login
host="127.0.0.1"
port=5672
user="guest"
password="guest"
amqp_spec="/usr/share/amqp/amqp.0-10.xml"
# If an alternate host or port has been specified, use that instead
# (this is used in our unit tests)
#
# If AMQP_SPEC is defined, use it to locate the spec file instead of
# looking for it in the default location.
if len(sys.argv) > 1 :
host=sys.argv[1]
if len(sys.argv) > 2 :
port=int(sys.argv[2])
try:
amqp_spec = os.environ["AMQP_SPEC"]
except KeyError:
amqp_spec="/usr/share/amqp/amqp.0-10.xml"
# Create a connection.
socket = connect(host, port)
connection = Connection (sock=socket, spec=qpid.spec.load(amqp_spec))
connection.start()
session = connection.session(str(uuid4()))
#----- Main Body -- ----------------------------------------
# Create a response queue for the server to send responses to. Use the
# same string as the name of the queue and the name of the routing
# key.
reply_to = "reply_to:" + session.name
session.queue_declare(queue=reply_to, exclusive=True)
session.exchange_bind(exchange="amq.direct", queue=reply_to, binding_key=reply_to)
# Create a local queue and subscribe it to the response queue
local_queue_name = "local_queue"
queue = session.incoming(local_queue_name)
# Call message_subscribe() to tell the broker to deliver messages from
# the server's reply_to queue to our local client queue. The server
# will start delivering messages as soon as message credit is
# available.
session.message_subscribe(queue=reply_to, destination=local_queue_name)
session.message_flow(local_queue_name, session.credit_unit.message, 0xFFFFFFFF)
session.message_flow(local_queue_name, session.credit_unit.byte, 0xFFFFFFFF)
# Send some messages to the server's request queue
lines = ["Twas brilling, and the slithy toves",
"Did gyre and gimble in the wabe.",
"All mimsy were the borogroves,",
"And the mome raths outgrabe."]
# We will use the same reply_to and routing key
# for each message
message_properties = session.message_properties()
message_properties.reply_to = session.reply_to("amq.direct", reply_to)
delivery_properties = session.delivery_properties(routing_key="request")
for line in lines:
print "Request: " + line
session.message_transfer(destination="amq.direct", message=Message(message_properties, delivery_properties, line))
# Now see what messages the server sent to our reply_to queue
dump_queue(reply_to)
#----- Cleanup ------------------------------------------------
# Clean up before exiting so there are no open threads.
session.close(timeout=10)
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